Paint preheater



Sept' l2, 1'950 A. A. ARvlNTz ET Al. 2,521,960

PAINT PREHEATER Filed June 2, 1948 INVENTORS HBRHHHM 4. HRW/wz ROBER? fr. HRl//N-rz Nn THF/N A HRW/vs BY ATTORNEY Patented Sept. 12, 1950 PAINT PREHEATER Abraham A. [Arvintz and Nathan A. Arvins, Brooklyn, and Robert A. Arvintz, New York, N. Y., assignors to Reliable Products Manufacturing Co., Inc., Brooklyn, N. Y., a corporation of New York Application June 2, 1948, Serial No. 30,576

This invention relates to apparatus for heating 'fluids of various kinds and classes. More particularly, the invention deals with apparatus of the kind under consideration for heating or pre-heating paints and similar liquids which have a tendency to congeal or'thicken, when standing, so that the same will be rendered more fluid and capable for use in conjunction with spraying apparatus for spraying paint or a solution on a suitable surface. Still more particularly, the invention deals with an apparatus of the character described having means for providing a substantial instantaneous, Aas wel1 as eicient heat generator for' transmitting heat units from the gen erated source, to the uid contained in a coil and in disposing the coil in a chamber outwardly `of the primary heat chamber of the apparatus. Still more particularlyJ the invention deals with apparatus of the type and kind having means for encouraging a quick circulation of heating medium in the primary heater chamber of the apparatus.

"Irhe'novel features of the invention will be best understood from the following description when taken together with the accompanying drawing, in which certain embodiments of the 'invention are disclosed, and in which the separate parts are designated by suitable reference characters vin each of the views; and in which:

Fig. l is a sectional View through the apparatus` diagrammatically illustrating the method of introducing heavy or congealed uid to the circulating coils of the apparatus.

Fig '2 is a view of the upper portion of the apparatus taken at right angles to Fig. 1; and

Fig. `3 is a plan view of the upper portion of the apparatus. A

'In Fig. l of the drawing,shown at Hl, is a suitable annular 4ring-like lbase of yL -s-haped crosssectional form, and yhaving an inner annular flange H upon which the tank or casing l 2 ci `the apparatus is mounted. The tank `or casing i2 comprises a double insulated wall bottom i3, and a Adouble insulated boundary wa-ll lll, having at its upper Vend `a detachable cover l5.

Supported upon the inner surface of the cover is an inverted conical cylinder i6 having a Ibottom wall Il supported in spaced relation from the Abottom t3 of the casi-ng so as Ito provide completely-around the sides and bottom of the cylinder t6, a chamber l 3 in which water or other fluid is .adapted to be placed and utilized to conduct heat 'to a pipe, coil, or other tube I9 arranged in the chamber lil. The coil it is also preferably conical in its formation toconiorrn with and be 14 Claims. (Cl. 21S- 39) 2 disposed in close proximity to the conical formation of the cylinder I6.

The cylinder it may be said to comprise a heating unit or lchamber of the .apparatus in-to which water 0r other fluid is adapted to be passed through an intake pipe 20 entering the chamber I8 through the top 4or cover l5. Coupled with the pipe 29 above the cover I5 is a watergage unit 2 l the top of which has a vent, as at 22. -A similar water gage unit 23 is mounted in connection with the cover l5 and is exposed to the chamber ki 8, the unit '2S having a vent, as Iat Zt. The cover l5 has centrally, an enlargedthreaded portion 25 with which is detachably mounted, an upper plug unit end 26 of an electric heating unit 21.

This unit extends downwardly into the cylinder i6, to a point well above the bottom of said cylinder, the unit 21 being arranged in an instantaneous heater tube 28.

The tube 28 is mounted in connection with the bottom of the cylinder I6 and extends upwardly into the cylinder to a point slightly above the uppermost winding of the coil I9. The lower end of the tube 28 has one or more small circulating passages 29 arranged above the botto-m of the tube 2B, providing fo1` .circulation of water upwardly through the tube 28, around the heating element 21 for discharge into the cylinder I6. In starting the apparatus, it will be apparent that the water in the tube 28 will be quickly heated by the element 2 4and caused to rise to the top of the tube, thus producing the quick circulatio-n and distribution of the 'heated Water for transfer to the water in the chamber i8 through the wall of the cylinder I6, and thus to the coil I9 to heat the heavy fluid material which is to :be circulated therethrough to reduce the same to fa more fluid state.

Mounted on .the enlargement 25 is a gland v,nut 25 for securing a packing gland l2-6 around the fitting "26, to eiect a seal of the tting inthe cover of the apparatus. f

'Passed through the ytop kor cover I5 of the apparatusfis an intake side 30 of Ithecoil 19. With this is coupled a pipe or tube .31, which leads to a pressure tanky 3'2 into .which the heavy fluid, such as heavy paint, ,enamels lacquers, varnishes and the like, or heavy chemicals of any type fand kind are adapted to be placed thereon .through an admission cap 33. The tank 32 has suitable means for introducing a pressure vmedium `oryto operate a pressure element to pressure discharge the material for transmission to the coil I9. For example, suitable pressure means may be intr-oduced through the pipe or tube 3ft at the bottom of the tank 32 to actuate a plunger or cylinder in the tank, as in other apparatus of this type and kind. The incoming heavy paint or chemical is brought out to the lowermost winding of the coil I9 and after being heated, is discharged through the discharge or exhaust pipe 35, which may extend to any suitable apparatus, such for example, as a spraying apparatus for spraying the same onto a surface, particularly when paints, lacquers, enamels, varnishes and the like are used, or for delivery of any type of pre-heated chemical to a predetermined station for utilization, treatment or the like.

Two thermostatic switches are also preferably employed, one switch 36 being coupled with the cover I to extend into the upper end of the chamber I8, and the other 31, mounted in the wall of the casing I2 to communicate with the lower end of the chamber I8. These switches will be suitably hooked-up with the electric sup- `ply to the element 21 to automatically shut on the electric supply should the temperature of the water or other fluid in the chamber I8 go beyond any predetermined fixed temperature. In this way, any danger of over-heating will be prevented. Furthermore, desirable temperatures can be maintained consistent with different types and kinds of materials which are pre-heated with the improved apparatus. The switches and 31 Will be set to operate, or in other words, break the circuit at slightly different temperatures, so that if one switch should fail for any reason, the other switch would operate to produce the desired result.

Mounted in the bottom I3 of the container I2, are two drains 38 and 39, the drain 38 being adapted to drain the water or other iiuid from the chamber I8, whereas the drain 39 is detachable with respect to the bottom I1 of the cylinder I6 and is adapted to drain said cylinder. Also mounted in the wall I4 of the casing I2 to extend into the chamber IS, is a thermometer til to indicate to an operator the temperature c-f the Water in the chamber I8 near the discharge end of the coil I9, the thermometer being stationed closely adjacent the discharge tube 35.

The plug unit 26, which supports the electric heating element 21 also supports a pilot light, diagrammatically illustrated at 4 I the light being in circuit with the element 21, so that when the element 21 is in operation, the light 4| will be illuminated, thus indicating to the operator that the apparatus is in operation.

It will be understood that the apparatus can be constructed in sizes suitable for the intended uses. In some instances, relatively small apparatus can be employed with a minimum amount of piping or tubing in the coil I9, whereas in other cases, the diameter and length of the coil may be increased and the general size of the apparatus proportionately increased. By mounting the coil in the manner defined, no possible discharge can be experienced from the standpoint of leakage or breakage in the coil, in having the fluid medium circulated therethrough, come into contact .with the heating element to cause accidents which might prevail, if such exposure were possible. Furthermore, the double chamber structure lends itself to utilizing different fluids as heat transmitting mediums in the respective chambers.

The inverted conical cylinder I6 will effectively stimulate circulation and provide at the discharge end portion of the coil I9, a rrelatively large area of heat conductive uid where this huid is at its greatest or highest temperature.

4 thereby insuring a positive control of the paint or chemical discharged through the tube 35, particularly by gaging the reading of the thermometer 49, or in otherwise testing the material at its point of delivery.

It will also be apparent that by detaching the drain 39 from the cylinder I6, and detaching the cap I5 from the casing I2, the entire unit comprising the cylinder I6, tube 28 and coil I9 and other associate parts, can be detached from the casing as and when it may be desired, to clean the casing or in any way repair the unit. While the cylinder I6 may be welded to the cover I5, it is preferred that the same be detached from the cover I5 by removing the coupling screws 42 for cleaning or repair to the interior of the cylinder. In this event, however, the coil I9 must also be removed through the medium of suitable couplings y43 and 44 provided on the cover through which the tubes 35 and 30 respectively pass.

No attempt has been made to show the electric wire employed as this is well known to those skilled in the art. It is suflicient to say that the two switches, as well as the pilot light, are in circuit to the heating unit 21 to controloperation thereof and to indicate its operation. In initially starting the apparatus, the heating unit will be put into operation shortly before pressure is in troduced through the pipe 34 to pressure discharge the material from the tank 32. By the time the heavy iluid or chemical is brought to the coil, the water or other iiuid in the cylinder IS and chamber I8 will be heated sufficiently to pre-heat this fluid to the desired temperature at the discharge end 35. In some instances, the feed will be relatively slow, depending upon the relative limit consumption at the discharge end, which is with the tube 35.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent is:

1. A paint pre-heater comprising a main insulated wall casing, a fr-usto-conical heating unit arranged within the chamber of the casing and spaced from the inner Walls thereof to form around said unit an annular chamber in which a fluid is adapted to be arranged, means gaglng the level of uid in said chamber, a coil in the chamber surrounding said heating unit and in spaced relation thereto, the casing having a cover in connection with which the cylinder is mounted, intake and discharge pipes for the coil being mounted in said cover, an electric heating element supported in connection with the cover and extending into said heating unit, an elongated tube mounted in the heating unit and surrounding the greater portion of said heating element and arranged in close proximity thereto, and the lower end of the tube having circulating passages whereby a uid arranged in the heating unit may circulate upwardly through said tube and downwardly in said heating unit,

2. A paint pre-heater comprising a main insulated wall casing, a frusto-conical heating unit. arranged Within the chamber of the casing andv spaced from the inner walls thereof to form around said unit an annular chamber in which a iiuid is adapted to be arranged, means gaging the level of fluid in said chamber, a coil in the cham-A ber surrounding said heating unit` and in spaced, relation thereto, the casing having a cover in connection with which the cylinder is mounted,kin take and discharge pipes for the coil being mount.-

ed in said cover, an electric heating element sup- .A ported in connection with the cover and extend.

ing-.into said heating ,unitJ an elongated tube mounted in .the heating unit and surrounding the greater `portion lcrfsaicl heating element and arranged in close proximity thereto, the lower end of the tube ,having circulating passages whereby a fluid arranged in the heating unit may circulate upwardly through said tube and downwardly in :said heating unit and means coupled with the intakepipe .of said coil for pressure feeding the paint through said coil.

.3. `Apaint pre-heater comprising a main insulated Wall casing, a .trusto-conical heating unit arranged within the chamber of the casing and spaced from the inner walls thereof to form around lsaid ,unit an annular chamber in which a is .adapted to be arranged, means gading the ,level .of fluid in said chamber, a coil in the chamber surrounding said heating unit and in snacedrelation thereto, the casing having a cover in connection with which the cylinder is mounted, intake and discharge pipes for the coil being mounted in said cover., anelectric heating element supported in connection with the cover `and extending into said heatingunit, an elongated tube mounted in the ,heating .unit and vsurrounding the greater portion .of said heating element and arranged :in close proximityy thereto, the lower end of the tube hal/.ing circulating passages whereby a huid arranged .in the Aheating ,unit may circulate upwardly through said tube and downwardly in, said heating unit, means coupled with the intake pipe of said `coil for pressure feeding the lated Wall casing, a :frusto-conical heating unit i arranged within the chamber of the .casing and spaced from the inner walls thereof to form around said unit an annular chamber in which a uid ,is Vadapted to :be arranged, means gaging the level .of :uid in said chamber, a coil in the chamber surrounding said heating unit and in spaced relation thereto, the casing having a cover inconnection kwith which the cylinder is mounted,rintake and discharge pipes for the coil being mounted insaid cover, ran .electric heating element supported in connection with the cover and extending into said heating unit, an elongated tube mounted inthefheating unit and surrounding the greater portion of said heating element and arnangedin close proximity thereto, the lower end ofi-.the tube having circulating passages Vwhereby a huid :arranged in :the heating unit may `circulate v.upwardly through said tube and downwardly in said heating unit, means .coupled with the intake pipe :of said coil for pressure feeding the paint through said coil, means for gaging a level of'iluid in said heating unit, a thermostatic switch mounted in said cover and exposed to said annular chamber, said switch being in circuit with and-controlling operation of said heating element, and -another similar lthermostatic switch mounted in the casing and exposed to the lower portion of saidlan-nular chamber.

5. A lpaint pre-heater comprising a main insulated wall casing, a fr-usto-conical heating unit arranged within the chamber of the casing and spaced from the inner walls thereof to form around said unit an annular chamber in which afl-uid is-adapted to be arranged, means gaging the level of duid in said chamber, a coil in the chamber vsurrounding said heating unit :and-in' :spacedrelation thereto, the casing vhailing a cover in connection with which the cylinder lis mounted, intake and discharge pipes -for the coil being mounted ,in said cover, an electric vheating elementsupported Ain connection with the cover and extending into ,said heating unit, an elongated tube mounted in .the heating unit` and surrounding the :greater portion of Asaid heating element and arranged in: close proximity thereto, the lower end of the 'tube having circulating passages whereby' `a huid arranged in the heating unit may circulate upwardly through said tube and downwardly in said heating unit, means coupled with the yintake pipe Aof saidv coil for pressure feeding the paint through said coil, means for gaging a level of fluid in .said heating unit, a thermostatic switch mounted in said cover andfexposed to said annular chamber, said `switch being in circuit .with vand controlling operation of said heating element, another similar thermostatic switch mounted in the casing and exposed to the lower portion Vof said annular chamber, and a thermometer exposed to the annular chamber of the heating unit adjacent the :discharge end of said coil.

6. A paint pre-heater comprising a main insulated wall casing, a frusto-conical heating unit arranged within the chamber of :the casing a-nd spaced from the inner walls thereof to form around said unit an annular chamber in which a fluid is adapted to be arranged, means ga'ging the level of fluid in ksaid chamber, a coil in the. chamber surrounding said heating yunit and' in spaced relation theretdthe casing having a .cover in connection with lwhich the cylinder is mounted, intake and Adischarge pipes for the coil' being mounted in said cover, an electric heating element supported in connection with the coverl and extending into said 'heating unit, an elongated tube mounted in the heating .unit and surrounding the greater portion of said heating element and arranged in close lproximity thereto, the lower .end of the tube having circulating passages whereby -a fluid arranged in thevheating unit may circulate upwardly through saidy tube and: downwardly in said heating unit, means coupled with the intake pipe of said coil for pressure feeding the paint through said coil, means for gaging a level of huid in said heating unit, a thermostatic switch mounted in said cover. and exposed to said annular chamber, said switch being inv vcircuit with and controlling operation ofY said heating element, yanother similar thermostatic switch mounted in the casing and exposed to the 'lower portion .of said annular'charnber, a thermometer exposed to the annular chamber of the heating unit adjacent the discharge end of said coil, and means for draining said heating unit.

7. .A paint Vpre-.lm-:ater comprising a main insulated wall casing, a ffrusto-conical heating unit arranged within the chamber of the casing and spaced from the inner 'walls thereof to form around fsa'id unit an annular chamber in which afluid is adapted to be arranged, means gaging the level of fluid in said chamber, a coil in the.

chamber surrounding said heating unit and in spaced relation thereto, the casing having a cover in connection with which the cylinder is mounted, :intake and discharge pipes for the coil beingr mounted in :said cover, an electric heating elementsupported in connection with `the cover' and extending into said heating unit, an elongated tube ymounted in the heating unit and surrounding the greater portion oi. said heating element and arranged in close proximity thereto, the lower end of the tube having 'circulating passages whereby a uid arranged in the heating unit may circulate upwardly through said tube and downwardly in said heating unit, means coupled with the intake pipe of said coil for pressure feeding the paint through said coil, means for gaging a level of iiuid in said heating unit, a thermostatic switch mounted in said cover and exposed to said annular chamber, said switch being in circuit with and controlling operation of said heating element, another. similar thermostatic switch mounted in the casing and exposed to the lower portion of said annular chamber, a thermometer exposed to the annular chamber of the heating unit adjacent the discharge end of said coil, means for draining said heating unit, and means for draining the chamber of said casing.

8. In apparatus for reducing heavy substances to iluid state, a casing, a circulating coil in the chamber of said casing, means for pressure feeding a heavy substance into and through the coil, a heating unit within the chamber of said casing and inwardly of said coil, the chamber of said casing being adapted to contain a heat transfer means disposed around said coil, said heating unit comprising a cylinder sealed within the chamber of said casing, a fluid heat transfer medium adapted to be arranged in the cylinder, an electric heating element arranged in said cylinder for heating the fluid therein, and automatically actuated means exposed to the chamber of said casing for controlling operation of said heating element.

9. In apparatus for reducing heavy substances to fluid state, a casing, a circulating coil in the chamber of said casing, means for pressure feeding a heavy substance into and through the coil, a heating unit within the chamber of said casing and inwardly of said coil, the chamber of said casing being adapted to contain a heat transfer means disposed around said coil, said heating unit comprising a lcylinder sealed within the chamber of said casing, a lluid heat transfer medium adapted to be arranged in the cylinder, an electric heating element arranged in said cylinder for heating the iluid therein, automatically actuated means exposed to the chamber of said casing for controlling operation of said heating element, and means within said cylinder and arranged in close proximity to said electric heating element for providing substantially instantaneous heating of the fluid in the cylinder.

10. In apparatus for reducing heavy substances to iluid state, a casing, a circulating coil in the chamber of said casing, means for pressure feeding a heavy substance into and through the coil, a heating unit within the chamber of said casing and inwardly of said coil, the chamber of said casing being adapted to contain a heat transfer means disposed around said coil, said heating unit comprising a cylinder sealed within the chamber of said casing, a fluid heat transfer medium adapted to be arranged in the cylinder, an electric heating element arranged in said cylinder for heating the lluid therein, automatically actuated means exposed to the chamber of said casing for controlling operation of said heating element, means within said cylinder and arranged in close proximity to said electric heating element for providing substantially instantaneous heating of the lluid in the cylinder, and said last named means encouraging circulation of the uid heating medium upwardly and downwardly in said cylinder.

' 11. In apparatus for reducing heavy substances to liiuid state, a casing, a circulating ccilin the chamber of said casing, means for pressure feeding a heavy substance into land through the coil, a heating unit within the chamber of said casing and inwardly of said coil, the chamber of said casing being adapted to contain a heat transfer means disposed around said coil, said heating unit comprising a cylinder sealed within the chamber of said casing, a fluid heat transfer medium adapted to be arranged in the cylinder, an electric heating element arranged in said cylinder for heating the fluid therein, automatically actuated means exposed to the chamber of said casing for controlling operation of said heating element, means within said cylinder and arranged in close proximity to said electric heating element for providing substantially instantaneous heating of the fluid in the cylinder, said last named means encouraging circulation of the fluid heating medium upwardly and downwardly in said cylinder, and means for gaging the level of fluid in said cylinder.

12. In apparatus of the character described, an insulated wall casing open at the top, a cover closing the open end of the casing and detachable with respect thereto, a tapered wall cylinder mounted in connection with the cover and arranged in the chamber of said casing and spaced with respect to the walls thereof to form a heat transfer chamber in said casing, a coil arranged in said chamber in spaced relation to said cylinder, said coil having intake and discharge means for circulating a medium therethrough, an elecric heating element mounted in the cover and extending into said cylinder for a greater portion ofthe length thereof, an elongated tube in the cylinder and arranged in close proximity to said heating element, said cylinder being adapted to contain a fluid heat transfer medium, and means whereby circulation of the fluid medium of said cylinder will take place upwardly through the tube of said cylinder and downwardly in the cylinder.

13. In apparatus of the character described, an insulated wall casing open at the top, a cover closing the open end of the casing and detachable with respect thereto, a tapered wall cylinder mounted in connection with the cover and arranged in the chamber of said casing and spaced with respect to the walls thereof to form a heat transfer chamber in said casing, a coil arranged in said chamber in spaced relation to said cylinder, said coil having intake and discharge means forcirculating a medium therethrough, an elec-A tric heating element, mounted in the cover and extending into said cylinder for a greater por-v tion of the length thereof, an elongated tube in the cylinder and arranged in close proximity to said heating element, said cylinder being adapted to contain a fluid heat transfer medium, means.

means for admitting a fluid heat transfer medium to the cylinder, an elongated electric heating element supported at one end of the cylinder and extending into the cylinder for a major portion of the length thereof,` a tube in Said cylinder in close proximity to said heating element and ex-` be circulated through said tube in one direction and through the cylinder in the opposed direction.

ABRAHAM A. ARVINTZ. NATHAN A. ARVIN S. ROBERT A. ARVINTZ.

REFERENCES CITED The following references are of record in the file of this patent;

Number 10 f UNITED STATES PATENTS Name Date Osgood Oct. .26, 1920 Tannehill Nov. 1, 1932 Ingison June 19, 1934 Clinefelter July 21, 1936 Johnson July 12, 1938 Erickson Aug. 1, 1939 Troupe June 6, 1944 Hudson June 5, 1945 

